i 
287 
The outcrop of the stratum was light yellow. The concealed part of 
the bed was bluish. Yellow chalk left on the specimens in thin layers 
became white or nearly so. The yellow and blue strata are definitely re- 
lated in most localities, the former being the superior, but in others they 
passed into each other on the same horizon. 
Stated Meeting, January 5th, 1872. 
Present 14 members. 
Joun ©. Cresson, Vice-President, in the chair. 
Letters of acknowledgment were received from Professor 
Lewis Strohmeyer, Dec. 8th, 1870 (81,82, Proc. A.P.S.), Boston 
Public Library, Dec. 19, 1871, R. Saxon Society, Feb. 8, and 
July 8, 1871 (84, 85, Trans., Vol. XTV.,, i. ii.), Natural History 
Society, Bremen, Aug. 29, 1871 (83, 84, 85) Professor Fre- 
richs, Feb. 8, 1871 (83, 84, 85), R. Bavarian Academy, Sept. 
18, 1871 (83, 84, 85, XIV., i. ii), R. Observatory, Munich, 
Aug. 14, 1871 (83, 84, 85), Imperial Russian P. C. Observa- 
tory, March 18, 1871 (62, 73, 74, 78, 81, 82, Trans. Vols. I. to 
IX., and XIIL,, iii.), Bordeaux Society of Sciences, Nov. 16, 
1871 (82 to 85), R. Academy, Berlin, Aug. 9, 1871 (83, 84, 
85, XII. i, XIV. i. ii.), Imperial Observatory, Prag., Aug. 16, 
1871 (83, 84, 85, XIV. i. 11.) 
Letters of envoy were received from the Chief of U.S. En- 
gineers, Washington, Dec. 21, 1871, and from the Imperial] 
P. ©. Observatory, St. Petersburg, Aug. 16, 1871. 
Donations for the Library were announced from the pub- 
lishers of the Flora Batava, and Dr. Schotel, P. C. Observa- 
tory, St. Petersburg, Academy and Observatory at Munich, 
Societies at Bonn and Bordeaux, Geographical Society and 
School of Mines at Paris, Mr. Stephenson, M. P. Newcastle- 
on-Tyne, London Nature, R. Astronomical Society,the Natural 
History Society at Bagota, 8. A.,the Massachusetts Historical 
Society, Boston Library, Old and New, Silliman’s Journal, 
